LTC1778 Просмотр технического описания (PDF) - Linear Technology
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LTC1778 Datasheet PDF : 24 Pages
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LTC1778/LTC1778-1
TYPICAL APPLICATIO
Typical Application 2.5V/3A at 1.4MHz
CSS
0.1µF
CC1
470pF
RC
33k
CC2
100pF
R1
11.5k
R2
C2
24.9k 2200pF
LTC1778
1
16
RUN/SS BOOST
RPG
100k 2
PGOOD
15
TG
3
VRNG
4
FCB
14
SW
13
PGND
5
ITH
6
SGND
7
ION
8
VFB
RON
220k
12
BG
11
INTVCC
10
VIN
9
EXTVCC
CIN: TAIYO YUDEN TMK432BJ106MM
COUT: CORNELL DUBILIER ESRD121M04B
L1: TOKO A921CY-1R0M
DB
CMDSH-3
CB
0.22µF
CVCC
4.7µF
RF
1Ω
CF
0.1µF
M1
1/2 Si9802
L1, 1µH
M2
1/2 Si9802
VIN
9V TO 18V
CIN
10µF
25V VOUT
2.5V
3A
+ COUT
120µF
4V
1778 TA03
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DESCRIPTION
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with 5-Bit VID
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High Efficiency, Synchronous Step-Down Controller
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Synchronous Step-Down Controller
LTC1876
2-Phase, Dual Synchronous Step-Down Controller with
Step-Up Regulator
LTC3713
LTC3778
LT®3800
Low VIN High Current Synchronous Step-Down Controller
Low VOUT, No RSENSE Synchronous Step-Down Controller
60V Synchronous Step-Down Controller
Burst Mode is a registered trademark of Linear Technology Corporation.
24 Linear Technology Corporation
1630 McCarthy Blvd., Milpitas, CA 95035-7417
(408) 432-1900 ● FAX: (408) 434-0507 ● www.linear.com
COMMENTS
8-Pin MSOP; Synchronizable; Soft-Start; Current Mode
97% Efficiency; No Sense Resistor; 16-Pin SSOP
Power Good Output; Minimum Input/Output Capacitors;
3.5V ≤ VIN ≤ 36V
Synchronizable 150kHz to 300kHz
Up to 42A Output; 0.925V ≤ VOUT ≤ 2V
Up to 42A Output; VRM 8.4; 1.3V ≤ VOUT ≤ 3.5V
Burst Mode® Operation; 16-Pin Narrow SSOP;
3.5V ≤ VIN ≤ 36V
Mobile VID; 0.925V ≤ VOUT ≤ 2V; 3.5V ≤ VIN ≤ 36V
Current Mode; 550kHz; Very Small Solution Size
Up to 95% Efficiency, 550kHz, 2.65V ≤ VIN ≤ 8.5V,
0.8V ≤ VOUT ≤ VIN, Synchronizable to 750kHz
3.5V ≤ VIN ≤ 36V, Power Good Output, 300kHz Operation
1.5V ≤ VIN ≤ 36V, 0.8V ≤ VOUT ≤ (0.9)VIN, IOUT Up to 20A
0.6V ≤ VOUT ≤ (0.9)VIN, 4V ≤ VIN ≤ 36V, IOUT Up to 20A
Current Mode, Output Slew Rate Control
1778fb
LT/LT 0405 REV B • PRINTED IN USA
© LINEAR TECHNOLOGY CORPORATION 2001
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